"With the IMRT plan you need to use 5 to 7 beams so you get low dose radiation which you don't have in the proton plan," says Hoppe.

Cassenti said, "This treatment allowed me to keep working I worked through this entire treatment didn't miss a day at work."

Cassenti is a part of the Channel 4 family. He's an engineer who keeps our equipment up and running and says he was never tired, in pain, and didn't really experience any side effects during his treatment.

The day of his final treatment was a special day and with his loving wife by his side he's ready to say goodbye to cancer and treatments because he is looking forward.

"I want to see what's going to happen down the line. A year from now there could be a side effect but again that's a year from now," says Cassenti.

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